[syslinux] PXELINUX booting delays with dual Ethernet ports

[Ole Holm Nielsen]

Luciano Miguel Ferreira Rocha wrote:
>> We're using PXELINUX for bootstrapping the network install our Linux cluster
>> nodes.  We just got some new IBM 326m dual-Opteron servers with Broadcom
>> NetXtreme BCM5780 dual-Gigabit Ethernet ports.
>> 
>> These dual-Ethernet servers work in an annoying way with PXELINUX when we
>> configure for booting from the local hard disk as the PXE-client downloads
>> this file from the DHCP/TFTP server:
>> 
>> label harddisk
>>    localboot 0
> 
> That tells the bios to continue to the next device. If you want to force
> harddisk boot, use chain.c32 instead. (chain hd0, i believe.)

Interesting observation !  This, however, contradicts the FAQ
http://syslinux.zytor.com/faq.php which says:
   On PXELINUX, specifying "LOCALBOOT 0" instead of a "KERNEL" option means
   invoking this particular label will cause a local disk boot instead of
   booting a kernel.

Could you kindly specify in exact detail the SYSLINUX configuration
file for forcing an immediate boot from hard disk (say, Linux /dev/sda)
in stead of the above "LOCALBOOT 0" ?  I find the FAQ too dense for my
(lack of) understanding.

Thanks a lot,
Ole